volume | PIER Journals

Abstract

To address the challenge of limited bandwidth in magnetic induction communication, this study proposes a magnetic induction antenna adopted a gradient-radius structure. The antenna adopts a discretized gradient-radius design, which effectively broadens the system bandwidth by increasing the antenna's resistance-to-inductance ratio. The study integrates theoretical analysis, simulation, and experimental testing to systematically investigate the effects of different taper ratio structures on resistance, inductance, and bandwidth. Experimental results demonstrated that the gradient-radius structure can significantly extend the bandwidth, and the extension effect became stronger as the taper ratio increased. Meanwhile, combined with simulation and experimental data, the attenuation effect of this structure on the near-zone magnetic field was evaluated, verifying that the bandwidth improvement came at the cost of coupling strength. Specifically, when the bandwidth was extended to nearly twice its original value, the received signal strength decreased by approximately 6.4 dBm. This study provides a simple and practical implementation approach for the broadband design of magnetic induction communication systems.

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Mr. Mingxuan Hu

Mrs. Lihua Li